Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_SLUB_DEF_H |
| 2 | #define _LINUX_SLUB_DEF_H |
| 3 | |
| 4 | /* |
| 5 | * SLUB : A Slab allocator without object queues. |
| 6 | * |
| 7 | * (C) 2007 SGI, Christoph Lameter <clameter@sgi.com> |
| 8 | */ |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/gfp.h> |
| 11 | #include <linux/workqueue.h> |
| 12 | #include <linux/kobject.h> |
| 13 | |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 14 | enum stat_item { |
| 15 | ALLOC_FASTPATH, /* Allocation from cpu slab */ |
| 16 | ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */ |
| 17 | FREE_FASTPATH, /* Free to cpu slub */ |
| 18 | FREE_SLOWPATH, /* Freeing not to cpu slab */ |
| 19 | FREE_FROZEN, /* Freeing to frozen slab */ |
| 20 | FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */ |
| 21 | FREE_REMOVE_PARTIAL, /* Freeing removes last object */ |
| 22 | ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */ |
| 23 | ALLOC_SLAB, /* Cpu slab acquired from page allocator */ |
| 24 | ALLOC_REFILL, /* Refill cpu slab from slab freelist */ |
| 25 | FREE_SLAB, /* Slab freed to the page allocator */ |
| 26 | CPUSLAB_FLUSH, /* Abandoning of the cpu slab */ |
| 27 | DEACTIVATE_FULL, /* Cpu slab was full when deactivated */ |
| 28 | DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */ |
| 29 | DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */ |
| 30 | DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */ |
| 31 | DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */ |
| 32 | NR_SLUB_STAT_ITEMS }; |
| 33 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 34 | struct kmem_cache_cpu { |
Christoph Lameter | da89b79 | 2008-01-07 23:20:31 -0800 | [diff] [blame] | 35 | void **freelist; /* Pointer to first free per cpu object */ |
| 36 | struct page *page; /* The slab from which we are allocating */ |
| 37 | int node; /* The node of the page (or -1 for debug) */ |
| 38 | unsigned int offset; /* Freepointer offset (in word units) */ |
| 39 | unsigned int objsize; /* Size of an object (from kmem_cache) */ |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 40 | #ifdef CONFIG_SLUB_STATS |
| 41 | unsigned stat[NR_SLUB_STAT_ITEMS]; |
| 42 | #endif |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 43 | }; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 44 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 45 | struct kmem_cache_node { |
| 46 | spinlock_t list_lock; /* Protect partial list and nr_partial */ |
| 47 | unsigned long nr_partial; |
| 48 | atomic_long_t nr_slabs; |
| 49 | struct list_head partial; |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 50 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 51 | struct list_head full; |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 52 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 53 | }; |
| 54 | |
| 55 | /* |
| 56 | * Slab cache management. |
| 57 | */ |
| 58 | struct kmem_cache { |
| 59 | /* Used for retriving partial slabs etc */ |
| 60 | unsigned long flags; |
| 61 | int size; /* The size of an object including meta data */ |
| 62 | int objsize; /* The size of an object without meta data */ |
| 63 | int offset; /* Free pointer offset. */ |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame^] | 64 | int order; /* Current preferred allocation order */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 65 | |
| 66 | /* |
| 67 | * Avoid an extra cache line for UP, SMP and for the node local to |
| 68 | * struct kmem_cache. |
| 69 | */ |
| 70 | struct kmem_cache_node local_node; |
| 71 | |
| 72 | /* Allocation and freeing of slabs */ |
| 73 | int objects; /* Number of objects in slab */ |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 74 | gfp_t allocflags; /* gfp flags to use on each alloc */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 75 | int refcount; /* Refcount for slab cache destroy */ |
Christoph Lameter | 4ba9b9d | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 76 | void (*ctor)(struct kmem_cache *, void *); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 77 | int inuse; /* Offset to metadata */ |
| 78 | int align; /* Alignment */ |
| 79 | const char *name; /* Name (only for display!) */ |
| 80 | struct list_head list; /* List of slab caches */ |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 81 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 82 | struct kobject kobj; /* For sysfs */ |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 83 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 84 | |
| 85 | #ifdef CONFIG_NUMA |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 86 | /* |
| 87 | * Defragmentation by allocating from a remote node. |
| 88 | */ |
| 89 | int remote_node_defrag_ratio; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 90 | struct kmem_cache_node *node[MAX_NUMNODES]; |
| 91 | #endif |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 92 | #ifdef CONFIG_SMP |
| 93 | struct kmem_cache_cpu *cpu_slab[NR_CPUS]; |
| 94 | #else |
| 95 | struct kmem_cache_cpu cpu_slab; |
| 96 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 97 | }; |
| 98 | |
| 99 | /* |
| 100 | * Kmalloc subsystem. |
| 101 | */ |
Christoph Lameter | 4b356be | 2007-06-16 10:16:13 -0700 | [diff] [blame] | 102 | #if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8 |
| 103 | #define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN |
| 104 | #else |
| 105 | #define KMALLOC_MIN_SIZE 8 |
| 106 | #endif |
| 107 | |
| 108 | #define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 109 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 110 | /* |
| 111 | * We keep the general caches in an array of slab caches that are used for |
| 112 | * 2^x bytes of allocations. |
| 113 | */ |
Christoph Lameter | 331dc55 | 2008-02-14 14:28:09 -0800 | [diff] [blame] | 114 | extern struct kmem_cache kmalloc_caches[PAGE_SHIFT + 1]; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 115 | |
| 116 | /* |
| 117 | * Sorry that the following has to be that ugly but some versions of GCC |
| 118 | * have trouble with constant propagation and loops. |
| 119 | */ |
Christoph Lameter | aa137f9 | 2007-08-31 00:48:45 -0700 | [diff] [blame] | 120 | static __always_inline int kmalloc_index(size_t size) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 121 | { |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 122 | if (!size) |
| 123 | return 0; |
Christoph Lameter | 614410d | 2007-05-06 14:49:38 -0700 | [diff] [blame] | 124 | |
Christoph Lameter | 4b356be | 2007-06-16 10:16:13 -0700 | [diff] [blame] | 125 | if (size <= KMALLOC_MIN_SIZE) |
| 126 | return KMALLOC_SHIFT_LOW; |
| 127 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 128 | if (size > 64 && size <= 96) |
| 129 | return 1; |
| 130 | if (size > 128 && size <= 192) |
| 131 | return 2; |
| 132 | if (size <= 8) return 3; |
| 133 | if (size <= 16) return 4; |
| 134 | if (size <= 32) return 5; |
| 135 | if (size <= 64) return 6; |
| 136 | if (size <= 128) return 7; |
| 137 | if (size <= 256) return 8; |
| 138 | if (size <= 512) return 9; |
| 139 | if (size <= 1024) return 10; |
| 140 | if (size <= 2 * 1024) return 11; |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame^] | 141 | if (size <= 4 * 1024) return 12; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 142 | /* |
| 143 | * The following is only needed to support architectures with a larger page |
| 144 | * size than 4k. |
| 145 | */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 146 | if (size <= 8 * 1024) return 13; |
| 147 | if (size <= 16 * 1024) return 14; |
| 148 | if (size <= 32 * 1024) return 15; |
| 149 | if (size <= 64 * 1024) return 16; |
| 150 | if (size <= 128 * 1024) return 17; |
| 151 | if (size <= 256 * 1024) return 18; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 152 | if (size <= 512 * 1024) return 19; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 153 | if (size <= 1024 * 1024) return 20; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 154 | if (size <= 2 * 1024 * 1024) return 21; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 155 | return -1; |
| 156 | |
| 157 | /* |
| 158 | * What we really wanted to do and cannot do because of compiler issues is: |
| 159 | * int i; |
| 160 | * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) |
| 161 | * if (size <= (1 << i)) |
| 162 | * return i; |
| 163 | */ |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Find the slab cache for a given combination of allocation flags and size. |
| 168 | * |
| 169 | * This ought to end up with a global pointer to the right cache |
| 170 | * in kmalloc_caches. |
| 171 | */ |
Christoph Lameter | aa137f9 | 2007-08-31 00:48:45 -0700 | [diff] [blame] | 172 | static __always_inline struct kmem_cache *kmalloc_slab(size_t size) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 173 | { |
| 174 | int index = kmalloc_index(size); |
| 175 | |
| 176 | if (index == 0) |
| 177 | return NULL; |
| 178 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 179 | return &kmalloc_caches[index]; |
| 180 | } |
| 181 | |
| 182 | #ifdef CONFIG_ZONE_DMA |
| 183 | #define SLUB_DMA __GFP_DMA |
| 184 | #else |
| 185 | /* Disable DMA functionality */ |
Al Viro | d046943 | 2007-07-20 16:18:06 +0100 | [diff] [blame] | 186 | #define SLUB_DMA (__force gfp_t)0 |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 187 | #endif |
| 188 | |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 189 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t); |
| 190 | void *__kmalloc(size_t size, gfp_t flags); |
| 191 | |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 192 | static __always_inline void *kmalloc_large(size_t size, gfp_t flags) |
| 193 | { |
| 194 | return (void *)__get_free_pages(flags | __GFP_COMP, get_order(size)); |
| 195 | } |
| 196 | |
Christoph Lameter | aa137f9 | 2007-08-31 00:48:45 -0700 | [diff] [blame] | 197 | static __always_inline void *kmalloc(size_t size, gfp_t flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 198 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 199 | if (__builtin_constant_p(size)) { |
Christoph Lameter | 331dc55 | 2008-02-14 14:28:09 -0800 | [diff] [blame] | 200 | if (size > PAGE_SIZE) |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 201 | return kmalloc_large(size, flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 202 | |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 203 | if (!(flags & SLUB_DMA)) { |
| 204 | struct kmem_cache *s = kmalloc_slab(size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 205 | |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 206 | if (!s) |
| 207 | return ZERO_SIZE_PTR; |
| 208 | |
| 209 | return kmem_cache_alloc(s, flags); |
| 210 | } |
| 211 | } |
| 212 | return __kmalloc(size, flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 215 | #ifdef CONFIG_NUMA |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 216 | void *__kmalloc_node(size_t size, gfp_t flags, int node); |
| 217 | void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 218 | |
Christoph Lameter | aa137f9 | 2007-08-31 00:48:45 -0700 | [diff] [blame] | 219 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 220 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 221 | if (__builtin_constant_p(size) && |
Christoph Lameter | 331dc55 | 2008-02-14 14:28:09 -0800 | [diff] [blame] | 222 | size <= PAGE_SIZE && !(flags & SLUB_DMA)) { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 223 | struct kmem_cache *s = kmalloc_slab(size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 224 | |
| 225 | if (!s) |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 226 | return ZERO_SIZE_PTR; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 227 | |
| 228 | return kmem_cache_alloc_node(s, flags, node); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 229 | } |
| 230 | return __kmalloc_node(size, flags, node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 231 | } |
| 232 | #endif |
| 233 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 234 | #endif /* _LINUX_SLUB_DEF_H */ |